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Method and device for registering 2D projection images relative to a 3D image data record

a technology of 2d projection and image data, applied in the field of 2d projection image registration relative to 3d image data record, can solve the problems of time-consuming 2d-3d registration algorithm, insufficient anatomy of the patient, and relatively unstable registration algorithm

Active Publication Date: 2006-11-23
SIEMENS HEALTHCARE GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0024] The invention is also intended for use on a device for executing the registration method described above. This includes an x-ray device which allows 2D projection images to be recorded from different projection angles, a data memory and also computing means for executing the spatial reconstruction and the 3D-3D registration. The x-ray device is preferably a C-arm device. This can be a monoplane device, with which the 2D projection images are recorded with different angulations of the C-arm. Especially preferably an x-ray biplane device is used with which two 2D projection images can be simultaneously recorded in each case. This naturally simplifies the symbolic 3D reconstruction, since the two projection images are guaranteed to be recorded in the same movement state of the object.

Problems solved by technology

The medical / technical difficulty with such interventions lies in that fact that, although the catheter can be visualized very exactly and at high resolution in the fluoroscopy images during the x-ray checking, the anatomy of the patient is only shown insufficiently in the fluoroscopy images.
These 2D-3D registration algorithms are time-consuming and relatively unstable as a result of their iterative “trial and error” character.

Method used

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  • Method and device for registering 2D projection images relative to a 3D image data record

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Embodiment Construction

[0029] Reference is initially made to FIG. 2 to illustrate the process of symbolic spatial reconstruction using a vessel tree 1 as an example. FIGS. 2a and 2b show the same vessel tree as a 2D projection image from two different projection angles in each case. These images have been recorded for example with the C-arm x-ray device shown in FIG. 3 with different C-arm angulations, with the visibility having being enhanced for example by contrast means injection. The individual vessel arms 2 are thus easy to recognize, and the vessel branches 6 can also be identified. A type of tree structure of this vessel section is thus already able to be identified from FIG. 2a without the precise location of the individual vessel branches in the space being able to be determined. To this end for example each vessel is approximated in each 2D projection image by a “centerline”4, which is marked as a dotted line in the largest vessel. Furthermore the vessel diameter could also be averaged over the ...

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Abstract

The invention relates to a method and a device for registering 2D projection images of an object relative to a 3D image data record of the same object, in which, from just a few 2D projection images, a 3D feature contained in an object, which is also identifiable in the 3D images, is symbolically reconstructed. The 3D feature obtained in this way is then registered by 3D-3D registration with the 3D image data record.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority of German application No. 10 2005 023 167.5 filed May 19, 2005, which is incorporated by reference herein in its entirety. FIELD OF THE INVENTION [0002] The invention relates to a method as well as to a device for registering 2D projection images of an object relative to a 3D image data record of the same object. BACKGROUND OF THE INVENTION [0003] With specific clinical examinations or treatments there is the need to register 2D projection images, especially x-ray fluoroscopy images, available in real time during the investigation, relative to a previously recorded 3D image data record, to enable the real time flouroscopy images to be overlaid with anatomical image information from the 3D image data record. Examples of such applications are for example minimally invasive investigations or treatments with endoscopes, laparoscopes or catheters, which are introduced into the patient's body via small opening...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/32
CPCG03B42/023G06T7/0028G06T2207/30101G06T2207/30048G06T7/0038Y10S128/922G06T7/33G06T7/38
Inventor BOESE, JANRAHN, NORBERT
Owner SIEMENS HEALTHCARE GMBH
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